<p><b>@leandrolanzieri</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/10799#discussion_r258495108">sys/include/registry/registry.h</a>:</p>
<pre style='color:#555'>> +     * failure
+     *
+     * @note The strings passed in @p argv do not contain the string of the name
+     * of the configuration group. E.g. If a parameter name is 'group/foo/var'
+     * and the name of the group is 'group', argv will contain 'foo' and 'var'.
+     */
+    char *(*hndlr_get)(int argc, char **argv, char *val, int val_len_max,
+                       void *context);
+
+    /**
+     * @brief Handler to set a the value of a configuration parameter.
+     * The value will be passed as a string in @p val.
+     *
+     * @param[in] argc Number of elements in @p argv
+     * @param[in] argv Parsed string representing the configuration parameter.
+     * @param[out] val Buffer containing the string of the new value
</pre>
<p>Values are handled everywhere in the registry as strings, terminated in <code>'\0'</code>, as the documentation states</p>

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